Go语言程序中嵌套if-else语句它始终是合法的，这意味着你可以使用一个if else在另一份if 或else if 语句声明中。

语法

嵌套if语句的语法如下：

if( boolean_expression 1)
{
   /* Executes when the boolean expression 1 is true */
   if(boolean_expression 2)
   {
      /* Executes when the boolean expression 2 is true */
   }
}

您可以嵌套else if ...else在类似if语句的方式。

例子：

package main

import "fmt"

func main() {
   /* local variable definition */
   var a int = 100
   var b int = 200
 
   /* check the boolean condition */
   if( a == 100 ) {
       /* if condition is true then check the following */
       if( b == 200 )  {
          /* if condition is true then print the following */
          fmt.Printf("Value of a is 100 and b is 200\n" );
       }
   }
   fmt.Printf("Exact value of a is : %d\n", a );
   fmt.Printf("Exact value of b is : %d\n", b );
}

让我们编译和运行上面的程序，这将产生以下结果：

Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200